For quite a number of weeks Ive had the feeling of someone behind me. Nobodys there psyhically but i can sense it and its not nice. anyone have any ideas? its really freaking me out as i get a pic in my head and its horrible. Plus cause this is always on my mind i get scared i might actually see it and it might materialise due to me thinking about it. ive heard you can produce 'thought threads'. help!

Ok first thig to do is use the white light technique.
Imagine a soap bubble around you and your bathed in a brilliant white bright light.  You can call on others for help also.  Many use Archangel Micheal, God (Your god), Their Guides etc.  The next best step is send them ALOT of love.  Imagine a huge rainbow of colours or pink and blue light and send it to them.  Tell them you love them and wish them the power of god to be by their side.  Anything dark will not be able to handle the loving thought so it will leave very quickly.  
The best defence is light and love.
What is the picture that you get in your minds eye?  
There can be many explanations for this, it could more than likely be an Earth bound spirit whom is lost and has moved with you in the hope of finding a better place or just because it recognizes you or your routine matches its older one.

Now I'm not the best for this but spiritalk will be so I will pm her this thread so she can see it and reply.  The mediumship board may also be a great place to post this also.

After you feel you have safely covered yourself in white light and this technique is best used all the time you can then ask it to leave.  Many spirits will just hang around unaware your scared but when asked to leave most will.  The ones who dont genearlly need more discussion.  
Some spirits will hang around others whom are unhappy, drink alot as this was their favourite pastime when alive.  so if your routine has changed and you find yourself drinking or depressed then they can come to you thinking you will be fun for them.  so the best way to rid yourself is to maintain a clean diet and to be happy and generally loving.

If it becomes to much or your unable to do the steps or are too afraid the best option is to go to your local spiritualist church so that they can help you.  Some things are best left to those whom have had experience and may be able to tell you exaclty what is there.

Now sometimes there is nothing there and most of the time this is more accurate.  You could just be more stressed out than normal and our imagination after seeing too many movies can get the better of us.  Or is that just me...I can not watch scary movies anymore I have to be so careful as my imagination is much scarier than any Dean koontz or Stephen King book/movie

Let me know how you get along

Light and love them first see how you go.......

Marie don't worry please. Try what flight_of_angelwings suggests and see if it helps. But know that you are safe, its really not anything bad, I know thats easy for me to say but try and keep calm. You mention 'thought threads' images that are conjured up by the mind, I am sure your imagination is much worse than any reality, and you really won't create anything at the moment except more fear. Our worst fear is fear itself.

When do these episodes occur? day or night or anytime and where? Are they only in one place or do they follow you?

I will send you lots of crystal light

Psychic/mediumship abilities begin with our senses...and yours appear to be wide open.  We can withdraw and/or expose our own body, mind, spirit according to our own thoughts, words, deeds.  Taking attention to how you are thinking and how you are manifesting these wonderful senses and whether you are taking them to the psychic level are all things you need to be aware of in your own environment as well.  Learn to open and close with the senses on a regular basis.  This is your best protection from the 'feelings' of someone following you around.

I am a lot more stressed due to family issues. This normally makes me more aware of 'spirits' as we call them. Its a woman with a blue/black face. And she always has her mouth open. Its horrid. I get a stronger sense of her in the living room and when Im on my computer I can sense her behind me. Also I know my place is haunted anyway and I can normally sense a different woman near our front door in the hallway. This different woman doesnt bother me as she is often in the bathroom watching me have a sneaky ciggie. I just dont know why the 'evil' woman keeps bothering me. I always sense dread around her. Ive never sensed her before until a couple of weeks ago. Also my daughter is unsettled at night in the living room.